Determinan- wersja połowiczna

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define ERROR_TEXT "ALLOCATING MEMORY PROBLEMS "

double **allocateMatrix();
void fillMatrix(double **matrix);
void showMatrix(double **matrix);
void freeMatrix(double **matrix);

int sizeOfMatrix;

void freeMatrix(double **matrix)
{
  int row;
  for(row = 0; row < sizeOfMatrix; row++)
  {
    free(matrix[row]);
  }
  free(matrix);
}

double **allocateMatrix()
{
  int rowIndex, row;
  double **matrix = malloc((sizeOfMatrix) * sizeof(double*));

  if(matrix == NULL)
  {
    printf(ERROR_TEXT);
  } else {
    for(rowIndex = 0; rowIndex < sizeOfMatrix; rowIndex++)
    {
      matrix[rowIndex] = malloc(sizeof(double) * (sizeOfMatrix));
      if(matrix[rowIndex] == NULL)
      {
        printf(ERROR_TEXT);
        for(row = 0; row < rowIndex; row++)
        {
          free(matrix[row]);
        }
        free(matrix);
      }
    }
  }
  return matrix;
}

void fillMatrix(double **matrix)
{
  int row, column;
  for(row = 0; row < sizeOfMatrix; row++){
    for(column = 0; column < sizeOfMatrix; column++){
      scanf("%lf", &matrix[row][column]);
    }
  }
}

void showMatrix(double **matrix)
{
  int row, column;
  for(row = 0; row < sizeOfMatrix; row++){
    for(column = 0; column < sizeOfMatrix; column++){
      printf("%lf \t", matrix[row][column]);
    }
    printf("\n");
  }
}

int main(){
  double **matrix = NULL;

  printf("Enter size of matrix: ");
  scanf("%d", &sizeOfMatrix);

  matrix = allocateMatrix(sizeOfMatrix);
  if(matrix != NULL)
  {
    fillMatrix(matrix);
    showMatrix(matrix);
    freeMatrix(matrix);
  }

  return 0;
}